JP2002347560A - Head protection air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hasten a development completion time of a bag and to reinforce tension on the lower end side of the bag in a head protection air bag device. SOLUTION: An A pillar part 14 side of the bag 34 is provided with a first guide roller 64 and a second guide roller 66, around which the intermediate part 58A of a front side strap 58 is wound. One end part 58B of the front side strap 58 is fixed to the front end side lower end part of a front seat bag part 42, while the other end part 58C is fixed to the front end side intermediate part. Thus, when the bag 34 is developed downward, the front side strap 58 is successively worked with tensions T1, T2, T3 to strengthen the tension working on the lower end side of the front seat bag part 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head protection airbag for deploying a bag stored in a folded state along a roof side rail portion of a vehicle into a curtain shape when a predetermined high load is applied to the side of the vehicle body. Related to the device.

[0002]

2. Description of the Related Art There are various forms of an airbag device as an occupant protection auxiliary device. In recent years, a bag has been housed along a roof side rail portion from a front pillar portion, and has been used at the time of side collision or rollover. In the specification, the head protection airbag device that protects the occupant's head by deploying the bag in the shape of a curtain during both times is referred to as “when a high load is applied to the side of the vehicle body”. It is becoming.

A number of applications have already been filed for this type of head protection airbag device. However, as the prior art of the present invention, the technology disclosed in US Pat. No. 6,099,029 is preferable. A brief description will be given.

In this head protection airbag device, a bag comprising a plurality of cells (expansion chambers) extending in the vehicle vertical direction and connected in parallel in the vehicle front-rear direction is folded into an elongated shape, and the airbag is extended from the A pillar portion to the roof side. Store along the rails,
When a predetermined high load is applied to the side of the vehicle body, the bag is inflated and deployed below the roof side rail from the front seat to the rear seat.

[0005]

However, in the case of the head protection airbag device having the above-described structure, the capacity of the bag is increased because the cells are connected over substantially the entire surface of the bag. For this reason, if the output of the inflator is not changed, there is a disadvantage that the time required for completing the bag deployment is delayed.

[0006] In order to solve the above-mentioned problem, cells need only be set in a minimum necessary range. In other words, if the cell is not set for the portion of the occupant's head outside the effective protection range so that the occupant does not inflate, the time required to complete the deployment of the bag is increased. However, if such a configuration is easily adopted, the tension at the lower end of the bag may be reduced.

SUMMARY OF THE INVENTION In view of the above background, an object of the present invention is to provide a head protection airbag device capable of shortening the time required for completing the deployment of a bag and increasing the tension at the lower end of the bag.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a vehicle which is stored in a folded state along a roof side rail portion of a vehicle and is moved downward under the roof side rail portion when a predetermined high load is applied to a vehicle body side portion. In the head protection airbag device in which the bag is deployed in a curtain shape, the bag corresponds to an inflatable portion provided corresponding to the protection area of the occupant's head and a portion other than the protection area of the occupant's head. And a non-inflatable portion provided by a plurality of guide members disposed between the bag and the pillar portion at a predetermined position in the longitudinal direction of the pillar portion, and an intermediate portion. The bag may be movably supported by the plurality of guide members, one end may be fixed to a lower front end or a lower rear end of the bag, and the other end may be fixed to a predetermined front end position or a predetermined rear end position of the bag. Flexible long section When, is configured to include a, the front end or rear end lower the lower to the vehicle front side of the bag with the lower extension of the bag tensioning means pulling toward the rear side of the vehicle is provided, it is characterized in that.

The head protection airbag device according to the second aspect of the present invention is the same as the first aspect, further comprising:
By suppressing or preventing reverse movement along the wiring direction of the flexible elongate member after the downward deployment of the bag,
It is characterized in that a slip-up preventing means for reducing or preventing the bag from slipping toward the upper side of the vehicle is provided.

According to the first aspect of the present invention, when a predetermined high load is applied to the side of the vehicle body, the bag stored in a folded state along the roof side rail portion of the vehicle is inflated, and the roof side rail portion is inflated. Is deployed in the shape of a curtain below. Since this bag has an inflatable portion corresponding to the protection area of the occupant's head, the inflatable portion of the bag is interposed between the occupant's head and the inner side surface of the vehicle body, and the occupant's head is provided. The part is effectively protected.

According to the present invention, since the bag includes the above-mentioned inflatable portion and the non-inflatable portion provided corresponding to a portion other than the protection area of the occupant's head, the non-inflatable portion is provided. Is not supplied with gas. Therefore, the bag capacity can be reduced, and the bag is brought into a completely downwardly deployed state (inflated state) sooner.

On the other hand, according to the present invention, since the tension applying means including the plurality of guide members and the flexible elongate member is provided between the bag and the pillar portion, when the bag is deployed downward, With the deployment operation of the bag, one end and the other end of the flexible elongated member move downward while the intermediate portion of the flexible elongated member moves while being supported by the plurality of guide members. It is pulled down. As a result, when the bag is completely deployed downward, the lower front end or lower rear end of the bag to which one end of the flexible elongate member is fixed is pulled toward the vehicle front side or the vehicle rear side. That is, according to the present invention, the tension acting on the lower end side of the bag can be strengthened by utilizing the downward force of the bag.

According to the second aspect of the present invention, as described above, when the bag is deployed downward, the tension acting on the lower end portion of the bag is strengthened by the tension applying means. After the deployment is complete,
The movement of the flexible elongate member in the opposite direction along the wiring direction is suppressed or prevented by the slip-up preventing means. That is, the flexible elongate member is restrained by the slip-up preventing means at the position where the tension is applied to the lower end of the bag. As a result, it is possible to reduce or prevent the bag after deployment from slipping.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A head protection airbag device 10 according to a first embodiment of the present invention will be described below with reference to FIGS. In these figures, the arrow FR appropriately shown indicates the forward direction of the vehicle, the arrow UP indicates the upward direction of the vehicle, and the arrow IN
Indicates the vehicle interior direction.

FIG. 3 is a perspective view showing the operation state of the head protection airbag device 10 according to the present embodiment together with the exterior of the vehicle interior, and FIGS. 1 and 2 show the head protection airbag device. Operating state and storage state of device 10 (non-operating state)
Is shown enlarged in side view.

As shown in these drawings, a vehicle body side portion 12 of this vehicle has an A pillar (front pillar) portion 14 and a B pillar (center pillar) portion 16 which are arranged with the longitudinal direction substantially in the vehicle vertical direction. , A plurality of pillar sections such as a C pillar (quarter pillar) section 18 and a D pillar section 20;
Further, it is configured to include a roof side rail portion 22 arranged on the roof side of the vehicle with the longitudinal direction of the vehicle as a longitudinal direction. Further, a front seat 24 and a rear seat 26 are provided in the vehicle interior.

The head protection airbag device 10 mounted on the vehicle is provided with a control unit 28 provided in the vicinity of the position where the console box is disposed and a control unit 28 for detecting a predetermined high load acting state on the side of the vehicle body. Airbag sensor 3
0, a substantially cylindrical inflator 32 that ejects a gas when activated, and a bag 34 that is inflated and deployed by the gas ejected from the inflator 32 as main components.

The airbag sensor 30 is disposed, for example, near the lower end of the B pillar 16 and near the lower end of the C pillar 18, and detects a predetermined high load acting state on the vehicle body side portion 12. , To the control unit 28. Note that a center airbag sensor (not shown) is also provided in the control unit 28. Further, a rollover sensor (not shown) for detecting a rollover state of the vehicle is provided in the control unit 28.

The bag 34 is stored (stored) along the A-pillar portion 14 and the roof side rail portion 22 in a state of being folded into a long shape. Therefore, the bag 34 is provided to a position beyond the C pillar 18 over the B pillar 16.

More specifically, as shown in FIG.
A gas introduction passage 40 is provided on the upper end side of the vehicle 4 and extends in the vehicle front-rear direction along the roof side rail portion 22 and has an open end on the vehicle rear side. An inflator 32 disposed between the C pillar portion 18 and the D pillar portion 20 of the roof side rail portion 22 is connected to a rear end opening of the gas introduction passage 40. Therefore, when the inflator 32 operates, the gas ejected from the inflator 32 is supplied into the gas introduction path 40.

In the bag 34, a front-seat bag portion 42 provided for the front seat 24 and a rear-seat bag portion 44 provided for the rear seat 26 are separated from each other. Is provided. The front bag portion 42 is provided with a front seat inflatable portion 46 corresponding to the protection area of the occupant sitting on the front seat 24, and the rear seat bag portion 44 is provided with an occupant sitting on the rear seat 26. A rear seat inflatable portion 48 is provided corresponding to the protection area. Each of the front-seat inflatable portion 46 and the rear-seat inflatable portion 48 includes a plurality of inflatable chambers 5 having a longitudinal direction in the vehicle vertical direction.
0 and 52 are arranged adjacently in front and behind. The upper ends of the expansion chambers 50 and 52 are connected to the gas introduction path 40.

Further, the bag 34 includes a B pillar 16.
In addition, a cut portion 54 for a B pillar portion as a “non-expandable portion” is provided in correspondence with the C pillar portion, and a cut portion 56 for a C pillar portion as a “non-expandable portion” is provided in correspondence with the C pillar portion 18. ing. Therefore, the bag 34 and the B pillar portion 16 and the C pillar portion 18 are not polymerized at all or slightly polymerized in a side view. Note that B
By forming the cut portion 54 for the pillar portion, the front seat inflatable portion 46 and the rear seat inflatable portion 48 are separated back and forth as described above. It is arranged on the front side of the cut portion 54, and the rear inflatable portion 48 is arranged on the rear side of the cut portion 54 for the B pillar portion. In addition, these parts are cut part 5
The reason why they are configured as 4, 56 is to reduce or prevent the upper end of the B pillar garnish and the upper end of the C pillar garnish when the bag 34 is deployed downward. On the other hand, the front portion (B
A non-inflated portion 68 that uses the bag base fabric as it is is provided in a portion that does not overlap with the pillar portion 16 and is also outside the occupant's head protection region).

When the bag 34 having the above structure is stored, the bag 34 for the front seat 42 and the bag 44 for the rear seat are folded or roll-folded in the gas introduction path 40 when stored. As a whole, it is folded into a long shape.

The lower end of the front end side of the bag 34 and the A-pillar section 14 are connected to a "flexible long member" described later.
Are connected to each other by a front side strap 58 as a front side. Similarly, the rear lower end of the bag 34 and the D pillar 2
The vicinity of 0 is interconnected by a long rear strap 60. Further, the rear lower end of the front seat bag portion 42 and the front lower end of the rear seat bag portion 44 are connected to each other by a short intermediate strap 62.

Here, the present embodiment is characterized by the arrangement structure of the front strap 58, and will be described in detail below.

A first guide member, which is rotatable about an axis, is provided at an intermediate portion in the height direction of the A pillar portion 14.
A guide roller 64 is provided. A second guide roller 66 as a “guide member” rotatable around an axis is also provided above the A-pillar portion 14 in the height direction. The first guide roller 64 and the second guide roller 66 and the above-described front strap 58
This constitutes the "tension applying means" in the present invention.

The intermediate portion 58A of the front strap 58 is provided with the first guide roller 64 and the second guide roller 66.
Is wrapped around. Accordingly, the intermediate portion 58A is movable along the first guide roller 64 and the second guide roller 66. Further, one end 58B of the front strap 58 is fixed to a lower end of the front end side of the front seat bag portion 42 by a fixing means such as sewing or bonding. Further, the other end 58C of the front strap 58 is provided at an intermediate portion in the height direction on the front end side of the front seat bag portion 42 (hereinafter, referred to as a front end).
(Referred to as "front end side intermediate portion") by a fixing means such as sewing or bonding.

To further supplement, depending on how much tension is applied to the lower end of the bag 34 when the bag is deployed downward, the fixing position of the other end 58C of the front strap 58 to the front seat bag portion 42 ( That is, the front strap 5
8 and how far the other end 58C is fixed from the one end 58B).

Next, the operation and effect of this embodiment will be described.

When a predetermined high load is applied to the vehicle body side portion 12, this state is detected by the airbag sensor 30 or the rollover sensor, and the control unit 2
8 is output. Therefore, the control unit 28
As a result, an operating current is supplied to the inflator 32, and a predetermined amount of gas is ejected from the inflator 32. After the gas ejected from the inflator 32 flows into the gas introduction passage 40 provided on the upper end side of the bag 34, the plurality of inflation chambers 5 forming the front seat inflation portion 46 of the front seat bag portion 42 are formed.
0 and the plurality of inflation chambers 52 constituting the rear inflation portion 48 of the rear bag portion 44. As a result, as shown in FIGS. 1 and 3, the bag 34 is deployed in a curtain shape below the roof side rail portion 22. As a result, the head of the occupant sitting in the front seat 24 is protected by the front seat inflatable portion 46, and the head of the occupant sitting in the rear seat 26 is protected by the rear seat inflatable portion 48. In other words, the front-seat inflatable portion 46 and the rear-seat inflatable portion 48, which are separated front and rear by being provided with the B-pillar portion cut portion 54, inflate and deploy independently and simultaneously, and the front seat 24 and the rear seat 26 Protect the heads of the occupants seated independently.

Here, first, in the case of the head protection airbag device 10 according to the present embodiment, B
A cut portion 54 for the B pillar portion is provided below the corresponding portion of the pillar portion 16, and a cut portion 56 for the C pillar portion is provided below the corresponding portion of the C pillar portion 18. The bag 34 does not inflate and deploy at the corresponding portion of the C-pillar portion 18 and the corresponding portion of the bag 18. Further, the non-inflated portion 68 of the rear seat bag portion 48 does not expand and deploy.

In other words, the bag 34 of the head-protecting airbag device 10 according to the present embodiment includes the front-seat inflatable portion 46 and the rear-seat inflatable portion 48 for protecting the occupant's head (and the inflatable portions 48 and 48). A gas introduction path 40 for supplying gas, and a cut portion 54 for a B pillar portion and a cut portion 56 for a C pillar portion as non-inflatable portions provided corresponding to portions other than the protection region of the occupant's head. In addition, since it is configured to include the non-inflating portion 68, the overall capacity of the bag 34 can be reduced. Therefore, the bag 34 is quickly brought to a completely downwardly deployed state (inflated state).

Next, in the head protection airbag device 10 according to the present embodiment, a tension applying means comprising the first guide roller 64, the second guide roller 64, and the front strap 58 is provided to the front seat bag portion 42. The bag 34
Is deployed downward, the intermediate portion 58A of the front strap 58 moves while being supported by the first guide roller 64 and the second guide roller 66 along with the deployment operation of the bag 34, and one end of the front strap 58 is moved. The portion 58B and the other end 58C are pulled down. Specifically, as the bag 34 is deployed downward, the bag 34
A predetermined tension T1 toward the lower side of the vehicle acts on the other end portion 58C of the front strap 58 fixed to the middle portion of the front end. Therefore, the intermediate portion 58 connected to the other end portion 58C.
In A, the first guide roller 64 to the second guide roller 66
The tension T2 in the direction toward acts. Thereby, the one end 58B connected to the intermediate part 58A has
The tension T3 in the direction toward the first guide roller 64 acts.

The rear lower end of the rear bag portion 44 is restrained by a rear strap 60. Further, the rear lower end of the front bag portion 42 and the rear bag portion 44 are restrained.
Are connected to each other and restrained by an intermediate strap 62 with the lower end of the front end.

From the above, when the bag 34 in the present embodiment is completely deployed downward, the front lower end portion of the front seat bag portion 42 to which the one end portion 58B of the front strap 58 is fixed is connected to the vehicle front side. Pulled to. That is, according to the present embodiment, the tension acting on the lower end side of the bag 34 can be strengthened by utilizing the downward force of the bag 34.

As a result, according to the head protection airbag device 10 according to the present embodiment, the deployment completion time of the bag 34 can be shortened, and the tension at the lower end side of the bag 34 can be strengthened.

[Second Embodiment] Next, a head protection airbag device 70 according to a second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 is a side view showing an operation state of the head protection airbag device 70 according to the present embodiment, and FIG. ) Are shown in side view.

As shown in these figures, in the head protection airbag device 70 according to the present embodiment, the A pillar 1
In contrast to the above-described first embodiment in which the tension applying means is disposed on the four sides, the present embodiment is characterized in that the tension applying means is disposed on each of the B pillar portion 16 and the C pillar portion 18.

More specifically, an intermediate portion in the longitudinal direction of the A-pillar portion 14 and a lower end portion on the front end side of the front seat bag portion 42 are connected to each other by a general band-shaped front seat front strap 72. ing. The front strap 7 for the front seat
2 is stretched with the vehicle longitudinal direction as the longitudinal direction when the bag 34 is deployed downward.

On the other hand, a first guide roller 74 and a second guide roller 76 as "guide members" are vertically arranged on the front end side of the B pillar portion 16 so as to face each other. The intermediate portion 78A of the front seat rear strap 78 as a “flexible long member” is movably wound around the first guide roller 74 and the second guide roller 76. One end 78 of the rear strap 78 for the front seat
B is fixed to a lower end portion on the rear end side of the front seat bag portion 42 by fixing means such as sewing or bonding. Further, the other end 78C of the rear strap 78 for the front seat is fixed to a lower portion on the rear end side of the bag portion 42 for the front seat by a fixing means such as sewing or bonding.

Further, on the rear end side of the B pillar 16,
Third guide roller 80 and fourth guide roller as “guide members”
Guide rollers 82 are disposed facing each other up and down. These third guide roller 80 and fourth guide roller 82
, A middle portion 84A of a rear strap 84 for a rear seat as a “flexible long member” is movably wound around the strap. Also, one end 84B of the front strap 84 for the rear seats
Is fixed to the lower end portion on the front end side of the rear seat bag portion 44 by fixing means such as sewing or bonding. Further, the other end portion 84C of the rear strap 84 for the rear seat is fixed to a lower portion on the front end side of the bag portion 44 for the rear seat by a fixing means such as sewing or bonding.

Further, on the front end side of the C pillar portion 18,
Fifth guide roller 86 and sixth guide roller as “guide members”
Guide rollers 88 are arranged facing up and down. These fifth guide roller 86 and sixth guide roller 88
, A middle portion 90A of a rear strap 90 for a rear seat as a “flexible long member” is movably wound around the rear strap 90. One end 90B of the rear strap 90 for the rear seat is also provided.
Is fixed to the lower end portion on the rear end side of the rear seat bag portion 44 by fixing means such as sewing or bonding. Further, the other end portion 90C of the rear strap 90 for the rear seat is fixed to a lower portion on the rear end side of the rear bag portion 44 by fixing means such as sewing or bonding.

Next, the operation and effect of this embodiment will be described.

When a predetermined high load is applied to the vehicle body side portion 12, this state is detected by the airbag sensor 30 and the like, and the inflator 32 is activated, and a portion corresponding to the protection area of the occupant's head in the bag 34 (front portion). Bag part 4 for seat
2 in that the front inflatable portion 46 and the rear seat inflatable portion 48) are deployed in a curtain shape below the roof side rail portion 22 in the same manner as in the first embodiment. is there.

Here, also in the head protection airbag device 70 according to the present embodiment, the configuration of the bag 34 itself is the same as that of the above-described first embodiment. Capacity can be reduced. Therefore, the bag 34 is quickly brought to a completely downwardly deployed state (inflated state).

Further, since tension applying means including the first guide roller 74, the second guide roller 76, and the front seat rear strap 78 is added to the front seat bag section 42, when the bag 34 is deployed downward, With the unfolding operation of the bag 34, the intermediate portion 78A of the rear strap 78 for the front seat moves while being supported by the first guide roller 74 and the second guide roller 76, and the rear strap for the front seat is moved. 7
The one end 78B and the other end 78C of 8 are pulled down. Specifically, as the bag 34 is deployed downward, the other end 78C of the rear strap 78 for the front seat fixed to the lower rear end of the bag portion 42 for the front seat has a predetermined downward direction toward the vehicle. The tension T1 acts. Therefore, the tension T2 in the direction from the first guide roller 74 to the second guide roller 76 acts on the intermediate portion 78A connected to the other end portion 78C. Thereby, the tension T3 in the direction toward the first guide roller 74 acts on the one end portion 78B connected to the intermediate portion 78A.

The front lower end portion of the front seat bag portion 42 is restrained by the A pillar portion 14 by a front seat front strap 72.

From the above, when the bag 34 in the present embodiment is completely deployed downward, the lower end on the rear end side of the front-seat bag portion 42 to which the one end portion 78B of the front-seat rear strap 78 is fixed. The part is pulled substantially rearward of the vehicle. Therefore, according to the present embodiment, the tension in the vehicle front-rear direction acting on the lower end side of the front-seat bag portion 42 can be strengthened by utilizing the downward force of the bag 34.

On the other hand, with respect to the rear seat bag portion 44, the tension in the vehicle front-rear direction acting on the lower end side of the rear seat bag portion 44 can be strengthened by the same principle. That is, when the rear seat bag portion 44 is deployed downward, the rear seat front strap 84 is attached to the rear seat bag portion T4, T4.
5, the tension of T6 acts, and the lower end portion on the front end side of the rear seat bag portion 44 is pulled substantially toward the front of the vehicle. at the same time,
The tension of T7, T8, and T9 acts on the rear strap 90 for the rear seat, and the lower end on the rear end side of the rear bag portion 44 is pulled substantially toward the vehicle rear side. Therefore, the tension in the vehicle front-rear direction acting on the lower end side of the backseat bag portion 44 can be strengthened by utilizing the downward deployment force of the bag 34.

As described above, according to the head protection airbag device 70 according to the present embodiment, the deployment completion time of the bag 34 can be shortened, and the tension at the lower end side of the bag 34 can be strengthened.

[Third Embodiment] Next, a head protection airbag device 100 according to a third embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in these figures, the head protection airbag device 100 according to the present embodiment is based on the configuration of the second embodiment described above, and is further provided with means for preventing the bag 34 from slipping up after deployment. There is a feature in that is added.

More specifically, in the embodiment shown in FIG. 6, a fan-shaped first stopper 102 as a "slip-up prevention means" is provided near the first guide roller 74. A second stopper 1 having the same shape as “slip-up preventing means” near the third guide roller 80.
04 is provided.

The first stopper 102 is rotatable about the support shaft 106, and is urged to rotate counterclockwise about the support shaft 106 by biasing means (not shown) such as a torsion coil spring. A tooth (ratchet tooth) 102A is formed on the peripheral edge of the first stopper 102 so as to be able to clamp (clamp) the intermediate portion 78A of the rear strap 78 for the front seat with the peripheral surface of the first guide roller 74. ing. Similarly, the second stopper 104 is rotatable around the support shaft 108, and is urged to rotate clockwise around the support shaft 108 by biasing means (not shown) such as a torsion coil spring. Also, the third edge of the second stopper 104
The front strap 84 for the rear seat is formed by the peripheral surface of the guide roller 80.
A tooth portion (ratchet tooth) 104A capable of sandwiching (clamping) the intermediate portion 84A of the intermediate portion 84A is formed.

On the other hand, in the embodiment shown in FIG. 7, the above-mentioned pair of first stoppers 102 and second stoppers 104 are disposed on both sides of the intermediate portion 78A of the rear strap 78 for the front seat. Similarly, the pair of first stoppers 1 described above is provided on both sides of the intermediate portion 84A of the rear strap 84 for the rear seat.
02 and a second stopper 104 are provided.

The head protection airbag device 100 having the above configuration.
According to the above, if the vehicle rolls over, it is conceivable that the bag 34 tends to slip after being deployed downward.

However, in the present embodiment, when the bag 34 is going to slip up, the tooth portion 102A of the first stopper 102 bites into the intermediate portion 78A of the rear strap 78 for the front seat in the configuration of FIG. Tooth portion 1 of first stopper 102
An intermediate portion 78A of the front seat rear strap 78 is sandwiched between 02A and the peripheral surface of the first guide roller 74. Similarly, the tooth portion 104A of the second stopper 104 bites into the intermediate portion 84A of the rear seat front strap 84, and the rear seat front side is located between the tooth portion 104A of the second stopper 104 and the peripheral surface of the third guide roller 80. An intermediate portion 84A of the strap 84 is clamped.

On the other hand, in the configuration shown in FIG. 7, the intermediate portion 78A of the rear strap 78 for the front seat and the intermediate portion 84A of the front strap 84 for the rear seat are held by the first stopper 102 and the second stopper 104, respectively. .

As described above, in any of the configurations, the rear strap 78 for the front seat and the front strap 84 for the rear seat are provided.
In the reverse direction along the wiring direction is suppressed or prevented. That is, the front rear strap 78 and the rear front strap 84 are restrained by the first stopper 102 and the second stopper 104 at the position where tension is applied to the lower end of the bag 34. Therefore, it is possible to reduce or prevent the bag 34 after deployment from slipping up. As a result, according to the present embodiment, the occupant restraint performance particularly at the time of rollover can be improved.

[Supplementary Explanation of the Embodiments] In the head protection airbag device 10 and the like according to the above-described embodiments, the A
The type was arranged from the pillar portion 12 to the front seat 24 and the rear seat 26 along the roof side rail portion 22. However, the present invention is not limited to this, and a three-row seat including a front seat, a middle seat, and a rear seat is provided. The head protection airbag device according to the present invention may be applied to a type of vehicle.

Further, in the head protection airbag device 10 and the like according to each of the above-described embodiments, the inflator 32 is disposed at the rear end side of the gas introduction passage 40 in the bag 34. As shown, a configuration in which the inflator 32 is disposed substantially at the center of the gas introduction path 40 may be employed, or a configuration in which the inflator 32 is disposed at the front end side of the gas introduction path 40 may be employed.

Further, in the head protection airbag device 10 and the like according to each of the above-described embodiments, the inflator 32 is directly connected to the rear end side of the gas introduction path 40. However, the present invention is not limited to this. It may be connected to the bag via a gas supply tube or the like.

In the first embodiment described above, the cut portion 54 for the B pillar portion and the cut portion 56 for the C pillar portion are provided to constitute these portions as non-expandable portions.
However, the present invention is not limited to this. For example, these portions may be replaced with the same configuration as the non-inflatable portion 68 formed of the base fabric of the bag.

Further, in each of the above-described embodiments, the guide roller is used as the guide member. However, the present invention is not limited to this.
Various configurations can be applied. For example, a pulley, a sprocket, or the like may be used instead of the roller.

In each of the above-described embodiments, the strap is used as the flexible long member. However, the present invention is not limited to this.
Each member such as a wire, a chain, and a string may be used. For example, when a chain is used, a sprocket may be used as the guide member.

Further, in the above-described third embodiment, the stopper having the teeth formed on the peripheral surface is used as the slip-up preventing means. However, the present invention is not limited to this. For example, a one-way clutch may be incorporated into the guide roller. May be.

Further, the configuration of the first embodiment and the second
The configuration of the third embodiment may be combined with the configuration of the embodiment, or the configuration of the third embodiment may be added to the configuration according to the combination. Particularly, in the former case, the tension acting on the lower end side of the bag 34 is set to the front. The tension can be most effectively strengthened independently and independently for each of the seat bag portion 42 and the rear seat bag portion 44.

Further, in each of the above-described embodiments, the front seat 2
The present invention is applied to a vehicle having both the rear seat 4 and the rear seat 26. However, the present invention is not limited to this, and as shown in FIG. 9, a vehicle of a type having only a front seat such as a pickup truck is provided. Even in such a case, the present invention is applicable. In this case, as the head protection airbag device 120, for example, the configuration shown in the second embodiment can be applied. That is, the bag 34 is disposed in a folded state over the range from the A pillar portion 14 to the B pillar portion 16 via the roof side rail portion 22, and when a predetermined high load acts on the vehicle body side, the inflator is inflated. The bag 34 is deployed downward along the side door 122 by the gas supplied from 32. A first guide roller 74 and a second guide roller 76 are disposed on the B pillar 16 side.
A rear strap 78 for a front seat is wound around these guide rollers 74 and 76 and fixed to the bag 34, so that the vehicle front-rear direction acting on the lower end side of the bag 34 on the same principle as in the second embodiment. Tension can be strengthened.

[0070]

As described above, in the head protection airbag device according to the first aspect of the present invention, the bag comprises an inflatable portion provided corresponding to the protection area of the occupant's head, And a non-inflating portion provided corresponding to a portion other than the protection region of the head portion of the head portion, and is disposed at a predetermined position in the longitudinal direction of the pillar portion between the bag and the pillar portion. A plurality of guide members, an intermediate portion is movably supported by the plurality of guide members, and one end is fixed to a lower front end or a lower rear end of the bag, and the other end is an intermediate front end or an upper front end of the bag. Or, a flexible elongate member fixed to the rear end middle portion or the rear end upper portion, respectively, and the front lower portion of the bag is directed to the vehicle front side or the rear lower portion is set to the vehicle as the bag is deployed downward. Since a tension applying means to pull backward is provided It can accelerate the development completion time of the bag, yet has the excellent effect of being able to enhance the tension in the bag bottom side.

The head protection airbag device according to the second aspect of the present invention is the same as the first aspect, further comprising:
Slip-up prevention means is provided for suppressing or preventing reverse movement of the flexible elongate member in the wiring direction after the bag is unfolded downward, thereby reducing or preventing the bag from slipping upward in the vehicle. Therefore, it is possible to reduce or prevent the bag from slipping after being deployed, and as a result, it has an excellent effect that the occupant restraint performance particularly at the time of rollover can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged side view showing an operation state of a head protection airbag device according to a first embodiment.

FIG. 2 is an enlarged side view showing a stored state (non-operating state) of the head protection airbag device shown in FIG.

FIG. 3 is a schematic perspective view showing an operation state of the head protection airbag device according to the first embodiment together with an exterior of a vehicle cabin.

FIG. 4 is an enlarged side view showing an operation state of a head protection airbag device according to a second embodiment.

5 is an enlarged side view showing a stored state (non-operating state) of the head protection airbag device shown in FIG.

FIG. 6 is an enlarged side view showing a main part (a type in which a strap is sandwiched between guide rollers) in an operating state of a head protection airbag device according to a third embodiment.

7 is an enlarged side view showing a configuration different from that of FIG. 6 (a type in which a middle portion of a strap is sandwiched between a pair of stoppers).

FIG. 8 is a perspective view corresponding to FIG. 3, showing an embodiment in which an inflator is arranged at the center.

FIG. 9 is a side view showing an embodiment in which the present invention is applied to a pickup truck type vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Head protection airbag apparatus 12 Body side part 14 A pillar part 16 B pillar part 18 C pillar part 22 Roof side rail part 34 Bag 46 Front seat inflatable part 48 Rear seat inflatable part 54 B pillar cut part ( Non-expandable portion) 56 Cut portion for C pillar portion (non-expandable portion) 58 Front strap (flexible long member, tension applying means) 64 First guide roller (guide member, tension applying means) 66 Second guide roller ( Guide member, tension applying means) 68 Non-inflating portion 70 Head protection airbag device 74 First guide roller (guide member, tension applying means) 76 Second guide roller (guide member, tension applying means) 78 Rear side for front seat Strap (flexible long member, tension applying means) 80 Third guide roller (guide member, tension applying means) 82 Fourth guide roller (guide member, tension applying means) Applying means) 84 Front strap for rear seat (flexible long member, tension applying means) 86 Fifth guide roller (guide member, tension applying means) 88 Sixth guide roller (guide member, tension applying means) 90 Rear seat Back strap for use (flexible long member, tension applying means) 100 Head protection airbag device 102 First stopper (slip prevention means) 104 Second stopper (slip prevention means) 120 Head protection airbag device

Claims (2)

[Claims] 1. A head protection airbag device in which a bag is stored in a folded state along a roof side rail portion of a vehicle and a bag is deployed in a curtain shape below the roof side rail portion when a predetermined high load is applied to a side portion of the vehicle body. In the bag, the bag includes an inflatable portion provided corresponding to the protection area of the occupant's head, and a non-inflatable portion provided corresponding to a portion other than the protection area of the occupant's head. A plurality of guide members disposed at a predetermined position in the longitudinal direction of the pillar portion between the bag and the pillar portion, and an intermediate portion is movably supported by the plurality of guide members. A flexible elongate member having one end fixed to the lower front end or the lower rear end of the bag, and the other end fixed to a predetermined front end position or a predetermined rear end position of the bag, respectively. Under the bag Tensioning means for pulling the front end or rear end lower the lower to the vehicle front side of the bag with the deployment toward the rear side of the vehicle is provided, the head protection air bag device, characterized in that. 2. The method according to claim 1, further comprising: restraining or preventing the flexible elongate member from moving in the reverse direction along the wiring direction after the bag is unfolded downward, so that the bag is prevented from slipping upward in the vehicle. 2. The head protection airbag device according to claim 1, further comprising: means for preventing the head from rising.